Smowtion is very profitable for any high-traffic-blogs. Before join to their network, make sure you have a good Alexa Rank. If your Alexa Rank is very poor it's so hard to get accepted. Anyway, if you're blog doesn't has any traffic, you're earning will be very low. So, take your time to get traffics to your blog. If you're stuck, you can buy a cheap real traffic at forums like Digital Point forum. To buy 1000 impressions just pay for $1.
Actually there's one more way to make money on Smowtion: by referring people to join. You'll get 5% of your referred members revenue's for 6 months.
So, what are you waiting for? I think Smowtion is a great opportunity for new blogger who wants to monetize their blog.